Reduced pressure therapy blockage detection

ABSTRACT

Embodiments of a reduced pressure system and methods for operating the system are disclosed. In some embodiments, the system can include one or more processors responsible for various functions associated with various levels of responsiveness, such as interfacing with a user, controlling a vacuum pump, providing network connectivity, etc. The system can present GUI screens for controlling and monitoring its operation. The system can determine and monitor flow of fluid in the system by utilizing one or more of the following: monitoring the speed of a pump motor, monitoring flow of fluid in a portion of a fluid flow path by using a calibrated fluid flow restrictor, and monitoring one or more characteristics of the pressure pulses. The system can provide external connectivity for accomplishing various activities, such as location tracking of the system, compliance monitoring, tracking of operational data, remote selection and adjustment of therapy settings, etc.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional of U.S. patent application Ser. No. 14/210,062, filed on Mar. 13, 2014, which claims the benefit of U.S. Provisional Application No. 61/785,384, filed Mar. 14, 2013; the disclosures of which are hereby incorporated by reference in their entirety.

BACKGROUND

Embodiments of the present disclosure relate to methods and apparatuses for dressing and treating a wound with reduced pressure therapy or topical negative pressure (TNP) therapy. In particular, but without limitation, embodiments disclosed herein relate to negative pressure therapy devices, methods for controlling the operation of TNP systems, and method of using TNP systems.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the present invention will now be described hereinafter, by way of example only, with reference to the accompanying drawings in which:

FIG. 1 illustrates a reduced pressure wound therapy system according to some embodiments.

FIGS. 2A-2F illustrate a pump assembly and canister according to some embodiments.

FIGS. 3A-3H illustrate a pump assembly according to some embodiments.

FIGS. 4A-4H illustrate a canister according to some embodiments.

FIGS. 5A-5C illustrate a kickstand in operation according to some embodiments.

FIGS. 6A-6F illustrate a canister according to some embodiments.

FIGS. 7A-7E illustrate a canister according to various embodiments.

FIGS. 8A-8G illustrate a pump assembly and canister according to certain embodiments.

FIGS. 9A-9C illustrate a canister bulkhead according to some embodiments.

FIG. 10 illustrates a canister filter stack according to some embodiments.

FIG. 11 illustrates a connection between a canister and pump assembly according to some embodiments.

FIG. 12 illustrates a strap mount attachment according to some embodiments.

FIGS. 13A-13B illustrate an attachment according to some embodiments.

FIG. 14 illustrates an electrical component schematic of a pump assembly according to some embodiments.

FIG. 15 illustrates a firmware and/or software diagram according to some embodiments.

FIGS. 16A-16S illustrate remote interface screens according to some embodiments

FIGS. 17A-17V illustrate graphical user interface screens according to some embodiments.

FIG. 18 illustrates a process of operating a device according to some embodiments.

FIGS. 19A-19B illustrate graphs of pressure pulses according to some embodiments.

FIG. 20 illustrates a graph of vacuum level according to some embodiments.

DETAILED DESCRIPTION OF SOME EMBODIMENTS

Overview

Embodiments disclosed herein relate to systems and methods of treating a wound with reduced pressure. As is used herein, reduced or negative pressure levels, such as −X mmHg, represent pressure levels relative to normal ambient atmospheric pressure, which can correspond to 760 mmHg (or 1 atm, 29.93 inHg, 101.325 kPa, 14.696 psi, etc.). Accordingly, a negative pressure value of −X mmHg reflects absolute pressure that is X mmHg below 760 mmHg or, in other words, an absolute pressure of (760−X) mmHg. In addition, negative pressure that is “less” or “smaller” than X mmHg corresponds to pressure that is closer to atmospheric pressure (e.g., −40 mmHg is less than −60 mmHg). Negative pressure that is “more” or “greater” than −X mmHg corresponds to pressure that is further from atmospheric pressure (e.g., −80 mmHg is more than −60 mmHg). In some embodiments, local ambient atmospheric pressure is used as a reference point, and such local atmospheric pressure may not necessarily be, for example, 760 mmHg.

Embodiments of the present invention are generally applicable to use in topical negative pressure (“TNP”) or reduced pressure therapy systems. Briefly, negative pressure wound therapy assists in the closure and healing of many forms of “hard to heal” wounds by reducing tissue oedema, encouraging blood flow and granular tissue formation, and/or removing excess exudate and can reduce bacterial load (and thus infection risk). In addition, the therapy allows for less disturbance of a wound leading to more rapid healing. TNP therapy systems can also assist in the healing of surgically closed wounds by removing fluid. In some embodiments, TNP therapy helps to stabilize the tissue in the apposed position of closure. A further beneficial use of TNP therapy can be found in grafts and flaps where removal of excess fluid is important and close proximity of the graft to tissue is required in order to ensure tissue viability.

In some embodiments, the pump assembly can include one or more processors or controllers responsible for various system functions associated with various levels of responsiveness, such as interfacing with a user (e.g., patient, physician, nurse, etc.), controlling a negative pressure pump, providing network connectivity, and the like. In some embodiments, levels of responsiveness can correspond to or be associated with levels of risk. For example, controlling a source of negative pressure may be classified as a high risk activity, as delivery of therapy is important for patient safety, healing, etc. Accordingly, controlling the source of negative pressure can be associated with a high level of responsiveness. The pump assembly can also include one or more input/output devices for receiving and providing data. These devices can include screens, touchscreens, buttons, knobs, ports, and the like. The pump assembly can be configured to present graphical user interface (GUI) screens for controlling and monitoring the operation of the TNP system.

In some embodiments, the TNP system can be configured to determine and monitor flow of fluid in the system. This can be accomplished by using one or more pressure transducers or sensors that measure pressure in a fluid flow path and provide feedback to a controller. In various embodiments, determining of fluid flow can be accomplished by utilizing one or more of the following techniques: monitoring the speed of a pump motor, monitoring flow of fluid in a portion of a fluid flow path by placing a calibrated fluid flow restrictor, and monitoring one or more characteristics, such as amplitude, frequency, or slope of detected pressure pulses. Calculated flow rate can be used to determine whether desired therapy is delivered to a patient, whether there are one or more leaks present in the system, and the like.

In some embodiments, the system can be configured to provide indication, alarms, etc. reflecting operating conditions to a user. The system can include visual, audible, tactile, and other types of indicators and/or alarms configured to signal to the user various operating conditions. Such conditions include system on/off, standby, pause, normal operation, dressing problem, leak, error, and the like. The indicators and/or alarms can include speakers, displays, light sources, etc., and/or combinations thereof. In various embodiments, indications, alarms, etc. are guided by one or more applicable standards.

In certain embodiments, a pump assembly can include one or more communications processors for providing external connectivity. Such connectivity can be used for various activities, such as location tracking of the pump assembly, compliance monitoring, tracking of operational parameters, remote selection and adjustment of therapy settings, and the like. Connectivity can include Global Positioning System (GPS) technology, cellular connectivity (e.g., 2G, 3G, LTE, 4G), WiFi connectivity, Internet connectivity, and the like. In some embodiments, wired connectivity can be utilized. In various embodiments, the pump assembly can communicate data to a cloud and receive data from the cloud. The data can include location data, compliance monitoring data, operational parameters, data for remote selection and adjustment of therapy settings, and the like.

Negative Pressure System

FIG. 1 illustrates an embodiment of a negative or reduced pressure wound treatment (or TNP) system 100 comprising a wound filler 130 placed inside a wound cavity 110, the wound cavity sealed by a wound cover 120. The wound filler 130 in combination with the wound cover 120 can be referred to as wound dressing. A single or multi lumen tube or conduit 140 is connected the wound cover 120 with a pump assembly 150 configured to supply reduced pressure. The wound cover 120 can be in fluidic communication with the wound cavity 110. In any of the system embodiments disclosed herein, as in the embodiment illustrated in FIG. 1, the pump assembly can be a canisterless pump assembly (meaning that exudate is collected in the wound dressing or is transferred via tube 140 for collection to another location). However, any of the pump assembly embodiments disclosed herein can be configured to include or support a canister. Additionally, in any of the system embodiments disclosed herein, any of the pump assembly embodiments can be mounted to or supported by the dressing, or adjacent to the dressing. The wound filler 130 can be any suitable type, such as hydrophilic or hydrophobic foam, gauze, inflatable bag, and so on. The wound filler 130 can be conformable to the wound cavity 110 such that it substantially fills the cavity. The wound cover 120 can provide a substantially fluid impermeable seal over the wound cavity 110. In some embodiments, the wound cover 120 has a top side and a bottom side, and the bottom side adhesively (or in any other suitable manner) seals with wound cavity 110. The conduit 140 or any other conduit disclosed herein can be formed from polyurethane, PVC, nylon, polyethylene, silicone, or any other suitable material.

Some embodiments of the wound cover 120 can have a port (not shown) configured to receive an end of the conduit 140. In some embodiments, the conduit 140 can otherwise pass through and/or under the wound cover 120 to supply reduced pressure to the wound cavity 110 so as to maintain a desired level of reduced pressure in the wound cavity. The conduit 140 can be any suitable article configured to provide at least a substantially sealed fluid flow pathway between the pump assembly 150 and the wound cover 120, so as to supply the reduced pressure provided by the pump assembly 150 to wound cavity 110.

The wound cover 120 and the wound filler 130 can be provided as a single article or an integrated single unit. In some embodiments, no wound filler is provided and the wound cover by itself may be considered the wound dressing. The wound dressing may then be connected, via the conduit 140, to a source of negative pressure, such as the pump assembly 150. In some embodiments, though not required, the pump assembly 150 can be miniaturized and portable, although larger conventional pumps such can also be used.

The wound cover 120 can be located over a wound site to be treated. The wound cover 120 can form a substantially sealed cavity or enclosure over the wound site. In some embodiments, the wound cover 120 can be configured to have a film having a high water vapour permeability to enable the evaporation of surplus fluid, and can have a superabsorbing material contained therein to safely absorb wound exudate. It will be appreciated that throughout this specification reference is made to a wound. In this sense it is to be understood that the term wound is to be broadly construed and encompasses open and closed wounds in which skin is torn, cut or punctured or where trauma causes a contusion, or any other surficial or other conditions or imperfections on the skin of a patient or otherwise that benefit from reduced pressure treatment. A wound is thus broadly defined as any damaged region of tissue where fluid may or may not be produced. Examples of such wounds include, but are not limited to, acute wounds, chronic wounds, surgical incisions and other incisions, subacute and dehisced wounds, traumatic wounds, flaps and skin grafts, lacerations, abrasions, contusions, burns, diabetic ulcers, pressure ulcers, stoma, surgical wounds, trauma and venous ulcers or the like. In some embodiments, the components of the TNP system described herein can be particularly suited for incisional wounds that exude a small amount of wound exudate.

Some embodiments of the system are designed to operate without the use of an exudate canister. Some embodiments can be configured to support an exudate canister. In some embodiments, configuring the pump assembly 150 and tubing 140 so that the tubing 140 can be quickly and easily removed from the pump assembly 150 can facilitate or improve the process of dressing or pump changes, if necessary. Any of the pump embodiments disclosed herein can be configured to have any suitable connection between the tubing and the pump.

In some embodiments, the pump assembly 150 can be configured to deliver negative pressure of approximately −80 mmHg, or between about −20 mmHg and −200 mmHg. Note that these pressures are relative to normal ambient atmospheric pressure thus, −200 mmHg would be about 560 mmHg in practical terms. In some embodiments, the pressure range can be between about −40 mmHg and −150 mmHg. Alternatively a pressure range of up to −75 mmHg, up to −80 mmHg or over −80 mmHg can be used. Also in other embodiments a pressure range of below −75 mmHg can be used. Alternatively a pressure range of over approximately −100 mmHg, or even 150 mmHg, can be supplied by the pump assembly 150.

In some embodiments, the pump assembly 150 is configured to provide continuous or intermittent negative pressure therapy. Continuous therapy can be delivered at above −25 mmHg, −25 mmHg, −40 mmHg, −50 mmHg, −60 mmHg, −70 mmHg, −80 mmHg, −90 mmHg, −100 mmHg, −120 mmHg, −140 mmHg, −160 mmHg, −180 mmHg, −200 mmHg, or below −200 mmHg. Intermittent therapy can be delivered between low and high negative pressure set points. Low set point can be set at above 0 mmHg, 0 mmHg, −25 mmHg, −40 mmHg, −50 mmHg, −60 mmHg, −70 mmHg, −80 mmHg, −90 mmHg, −100 mmHg, −120 mmHg, −140 mmHg, −160 mmHg, −180 mmHg, or below −180 mmHg. High set point can be set at above −25 mmHg, −40 mmHg, −50 mmHg, −60 mmHg, −70 mmHg, −80 mmHg, −90 mmHg, −100 mmHg, −120 mmHg, −140 mmHg, −160 mmHg, −180 mmHg, −200 mmHg, or below −200 mmHg. During intermittent therapy, negative pressure at low set point can be delivered for a first time duration, and upon expiration of the first time duration, negative pressure at high set point can be delivered for a second time duration. Upon expiration of the second time duration, negative pressure at low set point can be delivered. The first and second time durations can be same or different values. The first and second durations can be selected from the following range: less than 2 minutes, 2 minutes, 3 minutes, 4 minutes, 6 minutes, 8 minutes, 10 minutes, or greater than 10 minutes. In some embodiments, switching between low and high set points and vice versa can be performed according to a step waveform, square waveform, sinusoidal waveform, and the like.

In operation, the wound filler 130 is inserted into the wound cavity 110 and wound cover 120 is placed so as to seal the wound cavity 110. The pump assembly 150 provides a source of a negative pressure to the wound cover 120, which is transmitted to the wound cavity 110 via the wound filler 130. Fluid (e.g., wound exudate) is drawn through the conduit 140, and can be stored in a canister. In some embodiments, fluid is absorbed by the wound filler 130 or one or more absorbent layers (not shown).

Wound dressings that may be utilized with the pump assembly and other embodiments of the present application include Renasys-F, Renasys-G, Renasys AB, and Pico Dressings available from Smith & Nephew. Further description of such wound dressings and other components of a negative pressure wound therapy system that may be used with the pump assembly and other embodiments of the present application are found in U.S. Patent Publication Nos. 2012/0116334, 2011/0213287, 2011/0282309, 2012/0136325 and U.S. patent application Ser. No. 13/287,897, which are assigned to the assignee of present application and are incorporated by reference in their entirety. In other embodiments, other suitable wound dressings can be utilized.

Pump Assembly and Canister

FIG. 2A illustrates a front view 200A of a pump assembly 230 and canister 220 according to some embodiments. As is illustrated, the pump assembly 230 and the canister are connected, thereby forming a device. The pump assembly 230 comprises one or more indicators, such as visual indicator 202 configured to indicate alarms and visual indicator 204 configured to indicate status of the TNP system. The indicators 202 and 204 can be configured to alert a user to a variety of operating and/or failure conditions of the system, including alerting the user to normal or proper operating conditions, pump failure, power supplied to the pump or power failure, detection of a leak within the wound cover or flow pathway, suction blockage, or any other similar or suitable conditions or combinations thereof. In some embodiments, the pump assembly 230 can comprise additional indicators. In some embodiments, a single indicator is used. In other embodiments, multiple indicators are used. Any suitable indicator can be used such as visual, audio, tactile indicator, and so on. The indicator 202 can be configured to signal alarm conditions, such as canister full, power low, conduit 140 disconnected, seal broken in the wound seal 120, and so on. The indicator 202 can be configured to display red flashing light to draw user's attention. The indicator 204 can be configured to signal status of the TNP system, such as therapy delivery is ok, leak detected, and so on. The indicator 204 can be configured to display one or more different colors of light, such as green, yellow, etc. For example, green light can be emitted when the TNP system is operating properly and yellow light can be emitted to indicate a warning.

The pump assembly 230 comprises a display or screen 206 mounted in a recess 208 formed in a case of the pump assembly. In some embodiments, the display 206 can be a touch screen display. In some embodiments, the display 206 can support playback of audiovisual (AV) content, such as instructional videos. As explained below, the display 206 can be configured to render a number of screens or graphical user interfaces (GUIs) for configuring, controlling, and monitoring the operation of the TNP system. The pump assembly 230 comprises a gripping portion 210 formed in the case of the pump assembly. The gripping portion 210 can be configured to assist the user to hold the pump assembly 230, such as during removal of the canister 220. In some embodiments, the canister 220 can be replaced with another canister, such as when the canister 220 has been filled with fluid.

The pump assembly 230 comprises one or more keys or buttons 212 configured to allow the user to operate and monitor the operation of the TNP system. As is illustrated, in some embodiments, there buttons 212 a, 212 b, and 212 c are included. Button 212 a can be configured as a power button to turn on/off the pump assembly 230. Button 212 b can be configured as a play/pause button for the delivery of negative pressure therapy. For example, pressing the button 212 b can cause therapy to start, and pressing the button 212 b afterward can cause therapy to pause or end. Button 212 c can be configured to lock the display 206 and/or the buttons 212. For instance, button 212 c can be pressed so that the user does not unintentionally alter the delivery of the therapy. Button 212 c can be depressed to unlock the controls. In other embodiments, additional buttons can be used or one or more of the illustrated buttons 212 a, 212 b, or 212 c can be omitted. In some embodiments, multiple key presses and/or sequences of key presses can be used to operate the pump assembly 230.

The pump assembly 230 includes one or more latch recesses 222 formed in the cover. In the illustrated embodiment, two latch recesses 222 can be formed on the sides of the pump assembly 230. The latch recesses 222 can be configured to allow attachment and detachment of the canister 220 using one or more canister latches 221. The pump assembly 230 comprises an air outlet 224 for allowing air removed from the wound cavity 110 to escape. Air entering the pump assembly can be passed through one or more suitable filters (described below, such as in FIG. 10), such as antibacterial filters. This can maintain reusability of the pump assembly. The pump assembly 230 includes one or more strap mounts 226 for connecting a carry strap to the pump assembly 230 or for attaching a cradle. In the illustrated embodiment, two strap mounts 226 can be formed on the sides of the pump assembly 230. In some embodiments, various of these features are omitted and/or various additional features are added to the pump assembly 230.

The canister 220 is configured to hold fluid (e.g., exudate) removed from the wound cavity 110. The canister 220 includes one or more latches 221 for attaching the canister to the pump assembly 230. In the illustrated embodiment, the canister 220 comprises two latches 221 on the sides of the canister. The exterior of the canister 220 can formed from frosted plastic so that the canister is substantially opaque and the contents of the canister and substantially hidden from plain view. The canister 220 comprises a gripping portion 214 formed in a case of the canister. The gripping portion 214 can be configured to allow the user to hold the pump assembly 220, such as during removal of the canister from the apparatus 230. The canister 220 includes a substantially transparent window 216, which can also include graduations of volume. For example, the illustrated 300 mL canister 220 includes graduations of 50 mL, 100 mL, 150 mL, 200 mL, 250 mL, and 300 mL. Other embodiments of the canister can hold different volume of fluid and can include different graduation scale. The canister 220 comprises a tubing channel 218 for connecting to the conduit 140. In some embodiments, various of these features, such as the gripping portion 214, are omitted and/or various additional features are added to the canister 220.

FIG. 2A illustrates a rear view 200B of the pump assembly 230 and canister 220 according to some embodiments. The pump assembly 230 comprises a speaker port 232 for producing sound. The pump assembly 230 includes a filter access door 234 for accessing and replacing one or more filters, such as antibacterial filters. The pump assembly 230 comprises a gripping portion 236 formed in the case of the pump assembly. The gripping portion 236 can be configured to allow the user to hold the pump assembly 230, such as during removal of the canister 220. The pump assembly 230 includes one or more covers 238 configured to as screw covers and/or feet or protectors for placing the pump assembly 230 on a surface. The covers 230 can be formed out of rubber, silicone, or any other suitable material. The pump assembly 230 comprises a power jack 239 for charging and recharging an internal battery of the pump assembly. In some embodiments, the power jack 239 is a direct current (DC) jack. In some embodiments, the pump assembly can comprise a disposable power source, such as batteries, so that no power jack is needed.

The canister 220 includes one or more feet 244 for placing the canister on a surface. The feet 244 can be formed out of rubber, silicone, or any other suitable material and can be angled at a suitable angle so that the canister 220 remains stable when placed on the surface. The canister 220 comprises a tube mount relief 246 configured to allow one or more tubes to exit to the front of the device. The canister 220 includes a stand or kickstand 248 for supporting the canister when it is placed on a surface. As explained below, the kickstand 248 can pivot between an opened and closed position. In closed position, the kickstand 248 can be latched to the canister 220. In some embodiments, the kickstand 248 can be made out of opaque material, such as plastic. In other embodiments, the kickstand 248 can be made out of transparent material. The kickstand 248 includes a gripping portion 242 formed in the kickstand. The gripping portion 242 can be configured to allow the user to place the kickstand 248 in the closed position. The kickstand 248 comprises a hole 249 to allow the user to place the kickstand in the open position. The hole 249 can be sized to allow the user to extend the kickstand using a finger.

FIG. 2C illustrates a view 200C of the pump assembly 230 separated from the canister 220 according to some embodiments. The pump assembly 230 includes a vacuum attachment or connector 252 through which a vacuum pump communicates negative pressure to the canister 220. The pump assembly 230 comprises a USB access door 256 configured to allow access to one or more USB ports. In some embodiments, the USB access door is omitted and USB ports are accessed through the door 234. The pump assembly 230 can include additional access doors configured to allow access to additional serial, parallel, and/or hybrid data transfer interfaces, such as SD, Compact Disc (CD), DVD, FireWire, Thunderbolt, PCI Express, and the like. In other embodiments, one or more of these additional ports are accessed through the door 234.

FIG. 2D illustrates a schematic front view 230D and rear view 230D′ of a pump assembly 200D according to some embodiments.

FIG. 2E illustrates a view 200E of the interior components of the pump assembly 230 according to some embodiments. The pump assembly 230 can include various components, such as a canister connector 252 which includes a sealing ring 253, control printed circuit board (PCB) 260, peripherals PCB 262 (e.g., for USB connectivity), power supply PCB 264, vacuum pump 266, power supply 268 (e.g., rechargeable battery), speaker 270, and light guide or pipe 272 (e.g., for status indication using guided light emitted by one or more LEDs). Further details of status indication are provided in U.S. Pat. No. 8,294,586, which is assigned to the assignee of the present application and is incorporated by reference in its entirety. Other components can be included, such as electrical cables, connectors, tubing, valves, filters, fasteners, screws, holders, and so on. In some embodiments, the pump assembly 230 can comprise alternative or additional components.

FIG. 2F illustrates another view 200F of the interior components of the pump assembly 230 according to some embodiments. As is explained below, the pump assembly 230 includes an antenna 276. The connector 252 between the vacuum pump 266 and the canister 220 includes a flow restrictor 278. As is explained below, the flow restrictor 278 can be a calibrated flow restrictor used for measuring flow in the fluid flow path and for determining various operating conditions, such as leaks, blockages, high pressure (over-vacuum), and the like. In some embodiments, flow across the restrictor 278 can be determined by measuring a pressure differential (or pressure drop) across the flow restrictor. In various embodiments, flow across the restrictor 278 can be characterized as high flow (e.g., due to a leak), low flow (e.g., due to a blockage or canister being full), normal flow, etc. As is illustrated, pressure sensor 284 measures pressure upstream (or on the canister side) of the flow restrictor 278. Pressure sensor 284 can be an electronic pressure sensor mounted on the control PCB 264. Conduit or lumen 286 can connect the upstream side of the flow restrictor 278 with the pressure sensor 284. Pressure sensors 280 and 282 measure pressure downstream (or on the vacuum pump side) of the flow restrictor 278. Pressure sensors 280 and 282 can be electronic pressure sensors mounted on the control PCB 264. Conduit or lumen 288 can connect the downstream side of the flow restrictor 278 with the pressure sensors 280 and 284 via a Y-connector 289.

In some embodiments, one of pressure sensors 280 and 282 can be designated as a primary pressure sensor and the other as a backup pressure sensor in case the primary pressure sensor becomes defective or inoperative. For example, pressure sensor 280 can be the primary pressure sensor and pressure sensor 282 can be the backup pressure sensor. Pressure drop across the flow restrictor 278 can be determined by subtracting pressure measured by sensor 280 and sensor 284. If pressure sensor 280 fails, pressure drop across the flow restrictor can be determined by subtracting pressure measured by sensor 282 and sensor 284. In certain embodiments, the backup pressure sensor can be used for monitoring and indicating high pressure conditions, that is when the pressure in the flow path exceeds a maximum pressure threshold. In some embodiments, one or more differential pressure sensors can be used. For example, a differential pressure sensor connected to the upstream and downstream sides of the flow restrictor 278 can measure the pressure drop across the flow restrictor. In some embodiments, one or more of these components, such as the flow restrictor 278, are omitted and/or additional components, such as one or more flow meters, are used.

FIGS. 3A-3H illustrate a pump assembly according to some embodiments. FIG. 3A illustrates a perspective view 301A of the pump assembly. FIG. 3B illustrates another perspective view 302A of the pump assembly. FIG. 3C illustrates a front view 300B of the pump assembly. FIG. 3D illustrates a right side view 300C of the pump assembly. FIG. 3E illustrates a rear view 300D of the pump assembly. As is illustrated, the pump assembly includes a filter enclosure 302, which can comprise a removable cover for accessing one or more filters (as illustrated in FIG. 10 and described below). FIG. 3F illustrates a top view 300E of the pump assembly. FIG. 3G illustrates a left side view 300F of the pump assembly. FIG. 3H illustrates a bottom view 300G of the pump assembly.

FIGS. 4A-4H illustrate a canister, such as 300 mL canister, according to some embodiments. FIG. 4A illustrates a perspective view 400A of the canister. FIG. 4B illustrates another perspective view 401A of the canister. FIG. 4C illustrates a front view 400B of the canister. FIG. 4D illustrates a right side view 400C of the canister. FIG. 4E illustrates a rear view 400D of the canister. FIG. 4F illustrates a top view 400E of the canister. FIG. 4G illustrates a left side view 400F of the canister. FIG. 4H illustrates a bottom view 400G of the canister.

FIGS. 5A-5C illustrate a kickstand in operation according to some embodiments. FIG. 5A illustrates the kickstand 248 is an extended (or opened) position. As is illustrated, the pump assembly 230 and the canister 220 are connected or assembled together, such as by using the latches 221. The device 500A is supported on a surface by the kickstand 248 and feet 244. In the illustrated embodiment, the kickstand 248 is extended by operating one or more pivots 502. FIG. 5B illustrates positioning the device on the surface. As is illustrated in 500B, the kickstand 248 is extended and the device is placed substantially vertically on the surface and/or improve visibility of the screen 206 (e.g., by reducing glare). In 501B, the device is tilted so that it rests on the surface in a stable manner. The tilt of the device in 501B relative to 501A is illustrated by an indicator 512. In some embodiments, the tilt can be less than 30 degrees, about 30 degrees, or greater than 30 degrees. FIG. 5C illustrates the kickstand 248 that includes the hole 249 and two pivot holes 504. In some embodiments, the tilt of the device is adjustable to accommodate the needs of a user. For example, the kickstand 248 can utilize a ratchet mechanism.

FIGS. 6A-6F illustrate a canister, such as a 300 mL canister, according to some embodiments. FIG. 6A illustrates a perspective view 600A of the canister. The canister comprises a tube 140 configured to connect the canister to the wound cover 120. FIG. 6B illustrates a front view 600B of the canister. FIG. 6C illustrates a side view 600C of the canister. FIG. 6D illustrates another side view 600D of the canister. As is illustrated, the kickstand 248 is in an open position supporting the tilted canister on a surface. FIG. 6E illustrates a top view 600E of the canister. FIG. 6F illustrates a rear view 600F of the canister.

FIGS. 7A-7E illustrate a canister, such as a 800 mL canister, according to various embodiments. FIG. 7A illustrates a perspective view 700A of the canister. The canister comprises a tube 140 configured to connect the canister to the wound cover 120. The canister includes a vacuum attachment or connector 702 through which the canister receives vacuum communicated by the pump assembly 230. In some embodiments, the connector 702 is configured to be connected to or mated with the connector 252 of the pump assembly 230. FIG. 7B illustrates a front view 700B of the canister. FIG. 7C illustrates a side view 700C of the canister. FIG. 7D illustrates a top view 700D of the canister. FIG. 7E illustrates a rear view 700E of the canister. The canister comprises a clip 712 for holding the tube 140.

FIGS. 8A-8G illustrate a device according to certain embodiments. FIG. 8A illustrates a perspective view 800A of the device, which includes a pump assembly 230 and canister 220. The canister 220 can be connected to the pump assembly 230 using one or more latches 221, such as two latches 221 on the sides of the canister 220. FIG. 8B illustrates a front view 800B of the device. FIG. 8C illustrates a right side view 800C of the device. The device comprises a kickstand 248 that is configured to be opened or close via one or more pivots 502. FIG. 8D illustrates a rear view 800D of the device. FIG. 8E illustrates a top view 800E of the device. FIG. 8F illustrates a left side view 800F of the device. The latch 221 can be configured to connect to the recess 702 formed on the pump assembly 230 in order to connect the canister 220 to the pump assembly 230. FIG. 8G illustrates a bottom view 800G of the device. The canister 220 includes feet 244.

FIGS. 9A-9C illustrate a canister bulkhead 910 according to some embodiments. FIG. 9A illustrates a top view 900A of the canister bulkhead 910. FIG. 9B illustrates a perspective view 900B of the canister bulkhead 910. FIG. 9C illustrates a bottom view 900C of the canister bulkhead 910. The canister bulkhead can be configured to connect the canister 220 to a negative pressure source of the pump assembly 230, such as via a pump assembly bulkhead. To facilitate this function, the canister bulkhead 910 comprises a connector or port 902 which attaches to the vacuum connector 252 of the pump assembly 230. The canister bulkhead 910 also includes a gate mark or gate 906 to facilitate connecting the canister 220 to the pump assembly 230. The canister bulkhead 910 includes one or more regions or protrusions 904 configured to limit the capacity of the canister 220 as it fills up or when it becomes full so that the device (and the canister) can be oriented vertically, horizontally, and/or vertically tilted (e.g., when the kickstand 248 is extended). As is shown in FIGS. 9B and 9C, the volume of fluid held by the canister 220 is reduced or limited by the one or more protrusions 904. In some embodiments, the device bulkhead is flat. In other embodiments, the device bulkhead can mate with the features of the canister bulkhead 910.

FIG. 10 illustrates a canister filter stack 1000 according to some embodiments. The canister filter stack 1000 comprises a filter carrier 1002, shutoff 1004, odor filter 1006, and antibacterial filter 1008. The shutoff 1004 operates to stop suction when the canister 220 becomes full such that canister overfill is prevented. The shutoff can be formed out of hydrophilic material. The odor filter 1006 can comprise material that absorbs, reduces or eliminates odor. For example, such material can be active carbon, activated charcoal, or the like. The material can be hydrophobic. The antibacterial filter 1008 can inhibit or eliminate the growth of microorganisms. In some embodiments, the components of the filter stack 1000 can be arranged in any suitable order. For example, the odor filter 1006 can be integrated into the shutoff 1004 as an additive to the material of the shutoff 1004 or as a layer formed on the material of the shutoff 1004. In some embodiments, the filter stack 1000 is placed in the canister. In some embodiments, the filter stack 1000 is placed in the connector between the canister in the pump assembly. In some embodiments, the filter stack 1000 is placed in the pump assembly.

FIG. 11 illustrates a connection 1104 between the canister 220 and pump assembly 230 according to some embodiments. As is illustrated, the connection 1104 is placed between the vacuum attachment 1106 of the pump assembly 230 and the attachment or port 1102 of the canister 220. The connection 1104 can be a washer, ring, or the like which ensures a substantially leak-free seal between the canister 220 and the pump assembly 230.

Strap

In some embodiments, a strap can be attached to the pump assembly 230 for carrying the device of the shoulder, waist, etc. The strap can be adjustable in length. FIG. 12 illustrates a strap mount attachment 1200 according to some embodiments. The attachment 1200 can be detachably clipped onto strap mounts 226 (FIG. 2B) of the pump assembly 230. In operation, a hole 1202 of the attachment 1200 can be aligned with the strap mount, and a portion 1204 can be attached to the mount 226. The inner diameter of the portion 1204 can be selected so that there is a substantially tight fit with the mount 226. A strap (not shown) can be attached to a rod 1210. In some embodiments, two attachments 1200 are clipped onto two mounts 226 located on the opposing sides of the pump assembly 230.

In some embodiments, the device can be placed into a carrying case or carrying bag. The carrying case can be configured for accommodating the pump assembly 230 connected to the canister 220. The carrying case can include a pouch configured to enclose the device, the pouch comprising an upper portion and a lower portion. A lower opening in the lower portion of the pouch can be configured to permit insertion of the device. The lower opening can include a closure configured to close the lower opening and to prevent the apparatus from being displaced from the pouch. The lower opening can also include an aperture (e.g., for the tube 140) that remains open between an interior and exterior of the pouch after the closure closes the lower opening. The lower opening can comprise a flap that can be lifted to permit viewing of the canister 220. The upper portion can also include a flap that can be lifted to permit access to the display 206 and/or buttons 212. Additional details of the carrying bag are provided in U.S. Pat. No. 8,240,470, which is assigned to the assignee of the present application and is incorporated by reference in its entirety. In some embodiments, the pump assembly 230 and/or canister 220 includes a clip for attaching the pump assembly to a patient's belt, pocket, etc.

Cradle

FIGS. 13A-13B illustrate an attachment 1300 according to some embodiments. In operation, the attachment 1300 is used to mount the device on an IV pole, such as an IV pole having a diameter between 0.75 inches and 1.5 inches, a bedrail, such as a bedrail having a width of 1.5 inches or less, and the like. Accordingly, the attachment 1300 can be configured to be adjustable so that a secure connection can be made. As is illustrated in FIG. 13A, the attachment 1300 includes a cradle 1310, which attaches to the device, and a clamp 1330, which is adjusted by a knob 1334. In some embodiments, the cradle 1310 attaches to the device by placing a strap mount 226 into a recess 1302 and activating a closure 1318. The closure 1318 can be a latch, lock, or any other suitable mechanism. The cradle 1310 can include one or more closures 1318, such as two closures.

The attachment 1300 attaches to a pole, rail, or the like by turning the knob 1334 so that a portion of the pole, rail, or the like is placed between the backside of the cradle 1310 and the clamp 1330. The knob 1334 is then turned to provide a relatively tight attachment or sufficient hold of the device to the pole, rail, or the like. In some embodiments, a dual-threaded configuration of the attachment 1300 provides a sufficiently tight hold. The device can be dismounted from the pole, rail, or the like by unscrewing the knob. The device can be removed from the cradle 1310 by deactivating the one or more closures 1318. For example, the one or more closures 1318 can be pressed to allow detachment of the device from the cradle 1310. The attachment 1300 is configured to attach to poles, rails, or the like of various thickness. For example, the attachment 1300 can be attached to a thin tube as well as to a thick bedrail.

As is illustrated in FIG. 13B, the cradle 1310 includes a cradle body 1312 and lead screw for attaching the clamp 1330 and the knob 1334 to the cradle. The cradle 1310 also comprises a left closure 1316 and right closure 1318 for attaching the cradle to the device. The cradle 1310 further includes a bumper 1320, which can be made out of rubber, pin 1322, which can be a coiled spring, and screws 1324 and washers 1326 for attaching the closures 1316 and 1318 to the cradle. The clamp 1330 includes a clamp arm 1332, knob 1334, cap 1336, and pad 1338, such as a rubber pad.

In some embodiments, the rear of the pump assembly 230 can rest against the bumper 1320 when the cradle 1310 is attached. In certain embodiments recess(es) 1302 and/or closure(s) 1318 can be configured such that the cradle 1310 can be attached only such that the rear of the device rests against the bumper 1320. Attaching the device incorrectly, such as backwards so that the front of the deice rests against the bumper 1320, would not be allowed.

Electronics and Software

FIG. 14 illustrates an electrical component schematic 1400 of a pump assembly according to some embodiments. Electrical components can operate to accept user input, provide output to the user, operate the pump assembly and the TNP system, provide network connectivity, and so on. Electrical components can be mounted on one or more PCBs, such as the control PCB 260, peripherals PCB 262, and/or power supply PCB 264. As is illustrated, the pump assembly 230 can include multiple processors. It may be advantageous to utilize multiple processors in order to allocate or assign various tasks to different processors. In some embodiments, a first processor can be responsible for user activity and a second processor can be responsible for controlling the pump. This way, the activity of controlling the pump, which may necessitate a higher level of responsiveness (corresponding to higher risk level), can be offloaded to a dedicated processor and, thereby, will not be interrupted by user interface tasks, which may take longer to complete because of interactions with the user.

The pump assembly 230 can comprise a user interface processor or controller 1410 configured to operate one or more components for accepting user input and providing output to the user, such as the display 206, buttons 212, etc. Input to the pump assembly 230 and output from the pump assembly can controlled by an input/output (I/O) module 1420. For example, the I/O module can receive data from one or more ports, such as serial, parallel, hybrid ports, and the like. The processor 1410 also receives data from and provides data to one or more expansion modules 1460, such as one or more USB ports, SD ports, Compact Disc (CD) drives, DVD drives, FireWire ports, Thunderbolt ports, PCI Express ports, and the like. The processor 1410, along with other controllers or processors, stores data in one or more memory modules 1450, which can be internal and/or external to the processor 1410. Any suitable type of memory can be used, including volatile and/or non-volatile memory, such as RAM, ROM, magnetic memory, solid-state memory, Magnetoresistive random-access memory (MRAM), and the like.

In some embodiments, the processor 1410 can be a general purpose controller, such as a low-power processor. In other embodiments, the processor 1410 can be an application specific processor. In some embodiments, the processor 1410 can be configured as a “central” processor in the electronic architecture of the pump assembly 230, and the processor 1410 can coordinate the activity of other processors, such as a pump control processor 1470, communications processor 1430, and one or more additional processors 1480. The processor 1410 can run a suitable operating system, such as a Linux, Windows CE, VxWorks, etc.

The pump control processor 1470 can be configured to control the operation of a negative pressure pump 1490. The pump 1490 can be a suitable pump, such as a diaphragm pump, peristaltic pump, rotary pump, rotary vane pump, scroll pump, screw pump, liquid ring pump, diaphragm pump operated by a piezoelectric transducer, voice coil pump, and the like. In some embodiments, the pump control processor 1470 can measure pressure in a fluid flow path, using data received from one or more pressure sensors, calculate the rate of fluid flow, and control the pump. In some embodiments, the pump control processor 1470 controls the pump motor so that a desired level of negative pressure in achieved in the wound cavity 110. The desired level of negative pressure can be pressure set or selected by the user. In various embodiments, the pump control processor 1470 controls the pump (e.g., pump motor) using pulse-width modulation (PWM). A control signal for driving the pump can be a 0-100% duty cycle PWM signal. The pump control processor 1470 can perform flow rate calculations and detect alarms. The pump control processor 1470 can communicate information to the processor 1410. The pump control processor 1470 can include internal memory and/or can utilize memory 1450. The pump control processor 1470 can be a low-power processor.

A communications processor 1430 can be configured to provide wired and/or wireless connectivity. The communications processor 1430 can utilize one or more antennas 1440 (such as antenna 276) for sending and receiving data. In some embodiments, the communications processor 1430 can provide one or more of the following types of connections: Global Positioning System (GPS) technology, cellular connectivity (e.g., 2G, 3G, LTE, 4G), WiFi connectivity, Internet connectivity, and the like. Connectivity can be used for various activities, such as pump assembly location tracking, asset tracking, compliance monitoring, remote selection, uploading of logs, alarms, and other operational data, and adjustment of therapy settings, upgrading of software and/or firmware, and the like. In some embodiments, the communications processor 1430 can provide dual GPS/cellular functionality. Cellular functionality can, for example, be 3G functionality. In such cases, if the GPS module is not be able to establish satellite connection due to various factors including atmospheric conditions, building or terrain interference, satellite geometry, and so on, the device location can be determined using the 3G network connection, such as by using cell identification, triangulation, forward link timing, and the like. In some embodiments, the pump assembly 230 can include a SIM card, and SIM-based positional information can be obtained.

The communications processor 1430 can communicate information to the processor 1410. The communications processor 1430 can include internal memory and/or can utilize memory 1450. The communications processor 1430 can be a low-power processor.

In some embodiments, the pump assembly 230 can store data illustrated in Table 1. This data can be stored, for example, in memory 1450. In various embodiments, different or additional data can be stored by the pump assembly 230. In some embodiments, location information can be acquired by GPS or any other suitable method, such as cellular triangulation, cell identification forward link timing, and the like.

TABLE 1 Example Data Stored by the Pump Assembly Category Item Type Source GPS Location Latitude, Longitude, Acquired from GPS Altitude Timestamp Location Acquired Timestamp Therapy Total time therapy ON since device activation Minutes Calculated on device Total time therapy ON since last maintenance Minutes based an user control reset Device Placement; accumulated daily hours Minutes starting from first Therapy ON after last maintenance reset, stopping at last Therapy OFF before returning for Maintenance and maintenance reset. (Includes both THERAPY ON and THERAPY OFF hours) Device Serial Number Alphanumeric Set by Pump Utility Controller Firmware Version Alphanumeric Unique version identifier, hard coded in firmware Events Device Event Log (See Table 3 for example) List of Events (See Table 2) Generated in response to various user actions and detected events

In certain embodiments, the pump assembly 230 can track and log therapy and other operational data. Such data can be stored, for example, in the memory 1450. In some embodiments, the pump assembly 230 can store log data illustrated in Table 2. Table 3 illustrates an example event log according to some embodiments. One or more such event logs can be stored by the pump assembly 230. As is illustrated, the event log can include timestamps indicating the time of occurrence. In some embodiments, additional and/or alternative data can be logged.

TABLE 2 Example Data Tracked by the Pump Assembly Category ID Type Data Content Notes Device 0 Startup (Created DB) First time, out-of-the-box. 1 Startnp (Resumed DB) Subsequent power-ups. 2 Startup (Corrupt DB, Recreated) Corrupt configuration was detected. The database was deleted and recreated, and next run was in out-of-the-box mode. 3 Shutdown (Signaled) Normal shutdown, handled/registered by software. 4 Shutdown (Inferred) Unexpected shutdown; on next power-up, last active time registered as shutdown event. Therapy 5 Start Delivery (Continuous) modes, setpoints Modes are Y-connect status, and intensity. 6 Start Delivery (Intermittent) modes, setpoints Modes are Y-connect status, and intensity. 7 Stop Delivery 8 Set Therapy Pressure Setpoint mmHg This and other therapy adjustment events are only recorded while therapy is being delivered. 9 Set Standby Pressure Setpoint mmHg 10 Set Intermittent Therapy Duration setting (30 s, 60 s, etc) 11 Set Intermittent Standby Duration setting (30 s, 60 s, etc) 12 SetMode cont/intermittent 13 Set Intensity low/med/high 14 Set Y Connect yes/no Alarm 15 Over Vacuum high mmHg 16 High Vacuum high deviation mmHg 17 Blocked Full Canister low airflow lpm 18 High Flow Leak high airflow lpm 19 Low Vacuum low mmHg 20 Battery Failure 21 Critical Battery 22 Low Battery 23 Inactivity Maintenance 24 Maintenance Reset 25 Reset to Defaults 26 Software/Device Warning Warning code Any detected, minor unexpected software behavior will be logged as an event 27 Software/Device Fault Fault code Any detected, severe unexpected software behavior will be logged as an event

TABLE 3 Example Event Log Type Timestamp ID Type Description Data 1:23:45 4/2/2012 (UTC-12) 0 Startup (Created DB) 1:29:23 4/2/2012 (UTC-12) 15 Set Intensity medium 1:29:43 4/2/2012 (UTC-12) 10 Set Therapy Pressure Setpoint 120 mmHg 1:31:02 4/2/2012 (UTC-12) 7 Start Delivery (Continuous) 120 mmHg continuous, medium intensity, no Y connect 1:44:20 4/2/2012 (UTC-12) 20 High Flow Leak 4 lpm 1:40:24 4/2/2012 (UTC-12) 9 Stop Delivery

In some embodiments, using the connectivity provided by the communications processor 1430, the device can upload any of the data stored, maintained, and/or tracked by the pump assembly 230. In some embodiments, the following information can be uploaded to a remote computer or server: activity log(s), which includes therapy delivery information, such as therapy duration, alarm log(s), which includes alarm type and time of occurrence; error log, which includes internal error information, transmission errors, and the like; therapy duration information, which can be computed hourly, daily, and the like; total therapy time, which includes therapy duration from first applying a particular therapy program or programs; lifetime therapy information; device information, such as the serial number, software version, battery level, etc.; device location information; patient information; and so on. The device can also download various operational data, such as therapy selection and parameters, firmware and software patches and upgrades, and the like. In certain embodiments, the device can provide Internet browsing functionality using one or more browser programs, mail programs, application software (e.g., apps), etc. In various embodiments, additional processors 1480, such as processor for controlling the display 206, can be utilized.

FIG. 15 illustrates a firmware and/or software diagram 1500 according to some embodiments. A pump assembly 1520 includes a user interface processor firmware and/or software 1522, which can be executed by the user interface processor 1410, pump control processor firmware and/or software, which can be executed by the pump control processor 1470, communications processor firmware and/or software 1526, which can be executed by the communications processor 1430, and additional processor(s) firmware and/or software, which can be executed by one or more additional processors 1480. The pump assembly 1520 can be connected to a computer 1510, which can be a laptop, desktop, tablet, smartphone, and the like. A wired or wireless connection can be utilized to connect the computer 1510 to the pump assembly 1520. In some embodiments, a USB connection is used. The connection between the computer 1510 and the pump assembly 1520 can be used for various activities, such as pump assembly location tracking, asset tracking, compliance monitoring, selection, uploading of logs, alarms, and other operational data, and adjustment of therapy settings, upgrading of software and/or firmware, and the like. The pump assembly 1520 and computer 1510 can communicate with a remote computer or server 1540 via the cloud 1530. The remote computer 1540 can include a data storage module 1542 and a web interface 1544 for accessing the remote computer.

The connection between the computer 1510 and pump assembly 1520 can be utilized to perform one or more of the following: initialization and programming of the pump assembly 1520, firmware and/or software upgrades, maintenance and troubleshooting, selecting and adjusting therapy parameters, and the like. In some embodiments, the computer 1510 can execute an application program for communicating the pump assembly 1520.

The pump assembly 1520 can upload various data to the remote computer 1540 via the cloud 1530. In some embodiments, the pump assembly 1520 can upload data to one or more remote computers 1540. As explained above, upload data can include activity log(s), alarm log(s), therapy duration information, total therapy time, lifetime therapy information, device information, device location information, patient information, etc. In addition, the pump assembly 1520 can receive and process commands received from the cloud 1530.

Remote Interface

FIGS. 16A-16S illustrate remote interface screens or pages according to some embodiments. These screens can be generated in the web interface 1544 of the remote computer 1540. The remote computer 1540 can be referred to as a cloud platform. FIG. 16A illustrates a login screen 1600A for accessing data uploaded by one or more devices. The login screen 1600A includes a menu 1610, comprising menu item 1612 for accessing a home page, menu item 1614 for accessing device records, menu item 1616 for accessing fleet status, and menu item 1618 for accessing contacts page. The login screen 1600A also includes a search box 1632 for locating device information, a logout button 1634, and additional information menu 1636 for displaying accessibility information, terms of use, patent, trademark, and copyright notices, and disclaimers. Menu items 1612 through 1618 and the search box 1632 can be deactivated until the cloud platform 1540 successfully verifies user's credentials.

The login screen 1600A comprises a login window 1602 where a user enters credential for verification. If the user has forgotten their password, a link can be sent to the user's email account to allow the user to reset the password. After the cloud platform 1540 has verified the submitted login credentials, the application will display a home page 1600B illustrated in FIG. 16B. The home page 1600B displays an image of the device, a welcome message, the menu 1610, in which menu items have been activated, search box 1632 which has been activated, and logout button 1634. From the home screen 1600B, the user can select the device records 1614 menu item or fleet status menu item 1616 depending on whether the user would like to view one or multiple devices. In some embodiments, various groups of users with various privileges can be supported. For example, a treatment facility user group for facilities that own or rent multiple devices, can have administrator privileges allowing one or more users to add and/or remove devices. To accomplish this, the menu 1610 can have additional and/or alternative menu items, such as administrator item.

The user can select device records menu item 1614, which can bring up a device records screen 1600C illustrated in FIG. 16C. The device records screen 1600C includes a menu 1620 comprising menu items for searching devices 1621, device summary information 1622, device therapy information 1623, device alarms information 1624, device software and/or firmware updates 1625, device error log information 1626, and device location tracking 1627. The device records screen 1600C provide a list or table 1604 of all devices available to the user. The results can be split into separate pages to reduce page upload time. The table 1604 can be filtered by the search menu and can be sorted in ascending or descending order. The user can also select how many entries will be displayed per page.

Upon selecting a device in the table 1604, a device summary screen 1600D illustrated in FIG. 16D. In some embodiments, the user's login privileges will determine which data items will be shown on the page and whether the current device location will be reported. Table 4 illustrates which data items are visible on the device summary screen 1600D, according to the user's user group according to certain embodiments. As is illustrated in the table, the following user groups can be supported: administrator, clinician, billing, distributor/purchaser logistics, distributor/purchaser customer service/technical support, maintenance, customer service, hotline, logistics. In Table 4, FIG. 2-5 corresponds to FIG. 16D, FIG. 2-6 corresponds to FIG. 16E, FIG. 2-7 corresponds to FIG. 16F, FIG. 2-8 corresponds to FIG. 16G, FIG. 2-9 corresponds to FIG. 16H, FIG. 2-10 corresponds to FIG. 16I, and FIG. 2-11 corresponds to FIG. 16J.

Device properties can be shown in table 1605 and location information, including a map 1606 a, can be shown in table 1606. All values shown in tables 1605 and 1606 can reflect the latest dataset uploaded from the device. In some embodiments, where appropriate, a tooltip feature can be added to tables 1605 and 1606 to provide more detail (e.g., the definition of “Device Placement”) when a user hovers a pointing device over a particular table item. As is illustrated in table 1606, map 1606 a is used to display the latest reported address. The location coordinates, the time that this location was acquired by GPS (or via cellular network data), and the nearest street address are displayed alongside the map. The closest street address can be determined via reverse geo-coding.

According to some embodiments, the device summary screen 1600D corresponds to a summary screen as viewed by a user having administrator (“Admin”) privileges. As shown in Table 4, members of the “Admin” User Group will have access to all data items and navigation choices. All other User Groups will have access to various subsets of this screen, as described in Table 4. For example, FIG. 16E displays the summary screen 1600E as viewed by a user that has been assigned to a “Clinician” user group. Such user can view information listed in table 1607.

TABLE 4 Example Access to Device Information Based on User Credentials User Interface Accessibility Summary Screen (FIGS. 2-5, 2-6) Edit Total Device Serial Patient Device Manufacture Software Battery Battery User Group Members Properties Number Therapy Placement Date Version Charge Life Admin Website Y Y Y Y Y Y Y Y Administrator (S&N) Clinician Clinician Y Y Billing Customer - Y Y Y Renter (Billing) Distributor/ Purchaser (Billing) Billing (S&N) D/P Distributor/ Y Logistics Purchaser (Logistics) D/P CSTS Distributor/ Y Y Y Y Y Purchaser (Cust Serv/ Tech Support) Maintenance Distributor/ Y Y Y Y Y Y Purchaser (Maintenance) Quality & Complaints (S&N) Service & Repair (S&N) Customer Customer Y Svc Service (S&N) Hotline Clinical/ Y Y Y Y Y Technical Hotline (S&N) Logistics Logistics Y Y Y Y (S&N) User Interface Accessibility Summary Screen Software (FIGS. 2-5, 2-6) Therapy Alarms Update Error Location Device Log Log Log Log Tracking Lifetime Screen Screen Screen Screen Screen User Group Members Therapy Location (FIG. 2-7) (FIG. 2-8) (FIG. 2-9) FIG. 2-10) (FIG. 2-11) Admin Website Y Y Y Y Y Y Y Administrator (S&N) Clinician Clinician Y Y Billing Customer - Y Renter (Billing) Distributor/ Purchaser (Billing) Billing (S&N) D/P Distributor/ Y Y Logistics Purchaser (Logistics) D/P CSTS Distributor/ Y Y Purchaser (Cust Serv/ Tech Support) Maintenance Distributor/ Y Y Y Y Y Y Purchaser (Maintenance) Quality & Complaints (S&N) Service & Repair (S&N) Customer Customer Y Y Svc Service (S&N) Hotline Clinical/ Y Y Technical Hotline (S&N) Logistics Logistics Y Y Y Y (S&N)

FIG. 16F illustrates device therapy information screen 1600F. The screen 1600F can be selected via menu item 1623. In some embodiments, events listed in the therapy log 1652 include all therapy ON and OFF events, as well as adjustments to therapy mode and pressure. All past uploaded data can be displayed with each event sorted by its timestamp or in any order selected by the user. Device properties editor 1642 and report generator 1644 can be selected by the user to perform functions explained below.

FIG. 16G illustrates device alarm information screen 1600G. The screen 1600G can be selected via menu item 1624. In some embodiments, alarm logs listed in the table 1654 provide a sequential listing of each alarm event. Each event is described by the alarm type and any relevant data (e.g. over-vacuum high pressure). Different ordering options can be selected by the user. FIG. 16H illustrates device software information screen 1600H. The screen 1600H can be selected via menu item 1625. In some embodiments, the table 1656 lists all past successful (and, optionally, unsuccessful) software updates by their timestamps or in any other order selected by the user.

FIG. 16I illustrates device error information screen 1600I. The screen 1600I can be selected via menu item 1626. In some embodiments, the table 1658 lists each logged error event sequentially in the order selected by the user. The error fault or warning code is provided for each error event. FIG. 16J illustrates device location information screen 1600J. The screen 1600J can be selected via menu item 1627. In some embodiments, the table 1660 lists all past reported locations of the device. A map 1600 a illustrates markers at up to N of the most recent reported locations. N can be any suitable integer number. If a row 1660 b in the table 1600 is selected, then the corresponding marker on the map 1600 a will be highlighted.

FIG. 16K illustrates device properties editor screen 1600K. The screen 1600K can be selected via button 1642. In some embodiments, device properties editor 1662 allows the user to update device data not uploaded by the device, such as, for example, manufacturing date 1664, distributor information 1666, and facility information 1668. The distributor 1666 and facility 1668 fields can be drop down menus that show all distributor device groups stored on the cloud system 1540 and all facilities device groups stored under the selected distributor. Updated information can be saved in the cloud system 1540, such as in the data storage muddle 1542, by pressing the update button 1669.

FIG. 16L illustrates report generator screen 1600L. The screen 1600L can be selected via button 1644. In some embodiments, report generator 1670 can be used to download reports of past and current device records in CVS, PDF, or any other suitable format. The format of the report can be selected in 1672, report dates can be selected in 1676, properties for including in the report can be selected in 1676, and report can be generated and downloaded by pressing button 1678.

In some embodiments, a user, such as a facility user, can view multiple devices owned and/or leased. These devices can be referred to as a fleet. Fleet management can be selected via menu item 1616, which brings up a set of menus that displays the latest data from multiple devices in the user's current fleet.

In certain embodiments, to access fleet records, the user should first select one or more devices from the fleet search screen 1600M illustrated in FIG. 16M. Screen 1600M can be selected via menu items 1616 and 1621. Screen 1600M includes search menu 1682 and results table 1684. Data associated with one or more devices from the fleet can be displayed by pressing button 1686. Fleet device properties screen 1600N illustrated in FIG. 16N shows a list of summary data for a set of devices selected in the fleet search screen 1600M. Device properties are listed in the table 1690. The properties screen 1600N can be accessed via menu item 1622. Therapy data for the selected devices can be viewed by selecting menu item 1623 to bring up fleet device therapy information screen 16000O illustrated in FIG. 16O. In some embodiments, latest therapy information for all selected devices can be viewed in table 1692.

In various embodiments, fleet device battery information screen 1600P illustrated in FIG. 16P shows the last reported battery life and battery charge for all selected devices. Battery information can be displayed in the table 1694. The fleet battery information screen 1600P can be selected via menu item 1628. Fleet device software information screen 1600Q illustrated in FIG. 16Q shows the current software version, in table 1685, for all selected devices. The fleet device software information screen 1600Q can be selected via menu item 1629. Fleet device location information screen 1600R illustrated in FIG. 16R shows the last reported address for all selected devices. The fleet location information screen 1600Q can be selected via menu item 1629. Device location information can be shown in table 1696 which includes a map 1696 a. In some embodiments, the map 1696 a includes markers for N past locations of each selected device, where N is a suitable integer number.

Contacts page 1600S illustrated in FIG. 16S can be selected via menu item 16518. Contact information, such as administrative and technical contacts information, can be provided in window 1698.

Graphical User Interface

FIGS. 17A-17V illustrate graphical user interface (GUI) screens according to some embodiments. The GUI screens can be displayed on the screen 206, which can be configured as a touchscreen interface. Information displayed on the screens can be generated by and input received from the user can be processed by the processor 1410. The GUI screens can be utilized for initializing the device, selecting and adjusting therapy settings, monitoring device operation, uploading data to the cloud, and the like. Even though some of the screens 1700A-1700D include an outer Adobe Flash Player 10 window, the screens 1700A-1700D can be executed without Flash Player. In some embodiments, the screens 1700A-1700D can be generated directly by an operating system running on the processor 1410 and/or by a graphical user interface layer running on top of the operating system. For instance, the screens can be developed using Qt framework available from Digia.

FIGS. 17A-17D illustrated GUI screens 1700A-1700D for initializing the device according to various embodiments. In some embodiments, screens 1700A-1700D can be displayed when the device is powered on for the first time, after device reset, etc. Screen 1700A of FIG. 17A allows the user to select language in which the device will display and/or announce information to the user. The scroll bar 1702 allows the user to scroll through available languages. The user can select a desired language by pressing or tapping menu item 1701. After selecting the language, screen 1700B of FIG. 17B can be displayed to allow the user to select the time zone. The user can select the desired time zone by pressing menu item 1704. The user can return to the previous screen by pressing arrow 1703. In screen 1700C of FIG. 17C, the user can confirm the time zone selection by accepting it via button 1705 or rejecting it via button 1706. In screen 1700D of FIG. 17D, the user can complete the initialization by pressing the button 1707.

FIG. 17E illustrates a home screen 1700E according to some embodiments. The home screen 1700E can be displayed after the user has initialized the device. The home screen 1700E includes a status bar 1712 that comprises icons indicating operational parameters of the device. Animated icon 1713 is a therapy delivery indicator. In some embodiments, when therapy is not being delivered, icon 1713 is static and gray. When therapy is being delivered, icon 1713 turns orange and rotates (e.g., clockwise). Other status bar icons include volume indicator, and GPS and 3G connection indicator. The home screen includes a battery indicator 1716 for indicating battery charge level and date/time information 1718. The home screen 1700E includes a menu 1720 comprising menu items 1722 for accessing device settings, 1724 for accessing logs, 1726 for accessing help, and 1728 (see FIG. 17G) for returning to the home screen from other screens. In some embodiments, the device can be configured so that after a period of inactivity, such as not receiving input from the user, home screen 1700E is displayed.

The home screen 1700E includes therapy settings 1730 comprising negative pressure up and down controls 1732 and 1734 and scroll bar 1736 for adjusting the level of negative pressure. In some embodiments, up and down controls 1732 and 1734 adjust reduced pressure by a suitable step size, such as ±5 mmHg. As is indicated by label 1738, the current therapy selection is −80 mmHg. The home screen 1700E includes continuous/intermittent therapy selection 1740. Continuous therapy selection screen can be accessed via control 1742 and intermittent therapy selection screen can be accessed via control 1744. In certain embodiments, home screen 1700E illustrates continuous therapy selection screen. The home screen 1700E includes Y-connector selection 1745 for treating multiple wounds. Control 1746 selects treatment of a single wound, and control 1748 selects treatment of more than one wound by the device.

FIG. 17F illustrates home screen 1700F for selecting intermittent therapy according to some embodiments. Screen 1700F can be accessed via control 1744. Home screen 1700F includes intermittent therapy settings 1750 and 1755. As is illustrated by controls 1752, 1754, 1756, and 1758, current therapy selection is applying −80 mmHg for 5 minutes followed by 2 minutes of applying atmospheric pressure (or turning off the vacuum pump). Negative pressure levels and durations can be adjusted by selecting one of controls 1752, 1754, 1756, or 1758 and operating the up and down controls 1732 and 1736 or scroll bar 1736.

FIG. 17G illustrates settings screen 1700G according to some embodiments. Screen 1700G can be selected via menu item 1722. As is illustrated, wound volume 1760 can be adjusted (currently low wound volume corresponding to a small wound is selected), therapy intensity 1764 can be adjusted (currently low intensity is selected), and wound wizard 1768 can be activated (current selection is low/small). FIG. 17H illustrates wound volume selection screen 1700H, in which low volume (small wound) 1761, medium volume (medium wound) 1762, or high volume (large wound) 1763 can be selected. FIG. 17I illustrates therapy intensity selection screen 1700I, in which low intensity 1765, medium intensity 1766, or high intensity 1767 can be selected. In some embodiments, therapy intensity can be correspond to the volume of wound exudate and default negative pressure levels can be associated with various levels of therapy intensity. FIG. 17J illustrates wound wizard screen 1700J, in which small, low exudating wound 1769 can be selected, medium, moderately exudating wound 1770 can be selected, or large, high exudating wound 1771 can be selected. Therapy settings can be adjusted in accordance with user's selection of a wound type.

FIG. 17K illustrates a flow meter gauge screen 1700K according to some embodiments. The screen 1700K graphically indicates current leak rate in the system. The screen 1700K includes a dial 1775 with markings 1777, 1778, and 1779 and a gauge 1776. Low leak levels are illustrated by position of the gauge 1776. Higher leak rates may trigger an alarm.

FIG. 17L illustrates log screen 1700L for accessing therapy log data, alarm log data, and the like. The log screen 1700L can be selected via menu item 1724. The log screen 1700L includes therapy counter 1783 (e.g., relative to last device reset), log view selection controls 1781 and 1782, and log data viewer 1784. Control 1781 selects detailed view, and control 1782 selects overview presentation of log data. In some embodiments, screen 1700L illustrates detailed view of log data. Log data viewer 1784 illustrates events separated by calendar days 1785 and 1787. Calendar day 1785 shows that on Jan. 1, 2012, −120 mmHg of negative pressure therapy is being delivered starting at 12:30 am. Calendar day 1787 shows that on Dec. 31, 2012, the device experienced a blockage/canister full alarm at 7:33 pm (1788), at 7:45 pm intermitted therapy between −80 mmHg and atmospheric pressure (0 mmHg) was delivered (1789), and that deliver of the therapy was stopped at 11:45 pm (1790).

FIG. 17K illustrates log data overview screen 1700M according to some embodiments. The screen 1700M can be selected via control 1782. The overview screen 1700M includes a graph 1792 displaying log data corresponding to calendar days. Desired month can be selected using controls 1793. Bars, such as 1798, graphically illustrate therapy delivery time corresponding to a calendar day 1794. For example, on Dec. 21 (1794) 15 hours of therapy (1798) was delivered. In addition, alarm events are indicated by lines on the bars, such as lines 1795 and 1796. In some embodiments, pressing or tapping on a particular bar, such as bar 1798, can bring up a detailed view (not shown) of logged events for the corresponding day.

FIG. 17N illustrates help screen 1700N according to some embodiments. The main help screen 1700N can be accessed via control 1726. Help screen 1726 includes a menu of help items for alarms/troubleshooting 1802, reference guide 1804, video guides 1806, user guide 1808, and customer assistance 1810. Each of these items can be selected by pressing on a corresponding control. FIG. 17O illustrates video guides screen 1700O, which can be accessed via control 1806. The screen 1700O includes a list of videos, such as instructional videos for operating the device and/or system. Videos, reference guides, user guides, and the like can be stored in the device memory (e.g., memory 1450), downloaded and/or streamed from a network using a wired or wireless connection. In some embodiments, a list of available videos, reference guides, user guides, etc. is downloaded from a remote server and, in response to the user selecting a particular video or guide for viewing, the selected material is downloaded from the network and/or streamed over the network. A desired video can be selected and viewed, as shown in screen 1700P of FIG. 17P. The selected video can be viewed, paused, stopped, etc. by operating control 1814. FIG. 17Q illustrates a user guide screen 1700Q, which can be accessed via control 1808. User can scroll through information displayed in the screen 1700Q.

FIG. 17R illustrates alarm screens 1700R according to some embodiments. For example, during therapy delivery the device can detect high vacuum condition (e.g., high levels of vacuum are being applied to the wound cavity 110). The device can display a high vacuum alarm as is shown in the left screen of FIG. 17R indicting that high vacuum was detected while delivering therapy (information bar 1822). Because in certain embodiments such alarm cannot be silenced, therapy is paused, as is indicated by information bar 1822 shown on the right screen in FIG. 17R. This screen is displayed after the user presses therapy pause button 212 b as prompted by the screen on the left side of FIG. 17R. User can troubleshoot the system by selecting control 1820. If troubleshooting is successfully perform (e.g., leak is mitigated or eliminated), the device can display screen 1700T of FIG. 17T, and user can restart delivery of therapy.

FIG. 17S illustrates alarm screens 1700S according to certain embodiments. A low battery alarm is illustrated. In some embodiments, this alarm can be silenced for a period of time, during which delivery of therapy is being continued. The user can silence the alarm by selecting control 1823. Message 1824 can then be displayed alerting the user to charge the battery.

FIGS. 17U-17V illustrate data upload screens according to some embodiments. As is shown in screens 1700U, user can access data upload window 1830, which includes data upload controls 1832 (for starting the upload) and 1834 (for cancelling). If the user selects control 1832, message 1835 is displayed to the user indicating the data is being sent to the remote computer. If upload is successful, a confirmation screen (not shown) can be displayed. Such conformation screen can automatically fade away after a period of time. However, if the upload is not successful, screen 1700V of FIG. 17V can be displayed. The user can retry the upload by selecting control 1838 or access upload troubleshooting information by selecting control 1836.

FIG. 18 illustrates a process 1850 of operating a device according to some embodiments. The process 1850 can be executed by the processor 1410. In block 1852, the process 1850 provides GUI screens to the user. In block 1854, the process 1850 receives input from the user. In block 1856, the process 1856 performs one or more operations in accordance with input received from the user.

Flow Rate Monitoring

Some embodiments of the system monitor and/or determine a rate of flow of fluid in the system. In certain embodiments, flow rate monitoring can be performed by the pump control processor 1470 alone or in combination with the processor 1410. Monitoring the flow rate can be used, among other things, to ensure that therapy is properly delivered to the wound, to detect blockages, canister full conditions, and/or leaks in the fluid flow path, high pressure, ensure that the flow rate is not unsafe (e.g., dangerously high), etc.

In some embodiments, the system performs flow rate monitoring by measuring and/or monitoring speed of vacuum pump motor, such as, by using a tachometer. The pump control processor 1470 can continuously monitor voltage and/or current at which the pump is being driven using the tachometer feedback from the pump. Tachometer feedback can be used to determine the pump speed. If pump speed falls below a threshold value over a particular period of time, such as 2 minutes, it can be determined that a blockage is present in the flow path. The blockage can be due to a blockage in a tube or lumen, canister being full, etc. An alarm can be triggered and the system can wait for the user to take one or more actions to resolve the blockage.

In various embodiments, tachometer can be read periodically, such as every 100 msec, and periodic readings made over a time duration, such as 32 sec, can be combined (e.g., averaged). Combined tachometer readings can be used for leak detection, blockage detection, limiting the maximum flow rate, etc. Combined tachometer readings (e.g., in counts) can be converted to a flow rate (e.g., in mL/min) using one or more conversion equations and/or tables so that a current flow rate is determined. In some embodiments, the flow rate is determined according to the following equation: FR=C ₁ *F*P+C ₂

where FR is the flow rate, F is the frequency of the pump tachometer signal, P is pressure produced by the pump, and C₁ and C₂ are suitable constants. The determined flow rate can be compared to various flow rate thresholds, such as blockage threshold, leakage threshold, and maximum flow rate threshold, to determine a presence of a particular condition, such as a blockage, leakage, over-vacuum.

In some embodiments, a blockage condition is detected when the determined flow rate falls below a blockage threshold. A blockage alarm can be enabled if the blockage condition is present for a period of time, such as 30 seconds. The blockage alarm can be disabled when the determined flow rate exceeds the blockage threshold. In some embodiments, the system can differentiate between a blockage in a tube or lumen and canister full conditions. In some embodiments, a leakage condition is detected when the determined flow rate exceeds a leakage threshold. A leakage alarm can be enabled if the leakage condition is present for a period of time, such as 30 seconds. The leakage alarm can be disabled when the detected flow rate exceeds the leakage threshold. In some embodiments, in order to prevent an over-vacuum condition, a maximum flow rate is imposed, such as 1.6 liters/min. Pump drive signal, such as voltage or current signal, can be limited not exceed this flow rate threshold.

In certain embodiments, one or more pressure sensors can be placed in suitable locations in the fluid flow path. Pressure measured by the one or more sensors is provided to the system (e.g., pump control processor 1470) so that it can determine and adjust the pump drive signal to achieve a desired negative pressure level. The pump drive signal can be generated using PWM. Additional details of flow rate detection and pump control are provided in U.S. patent application Ser. No. 13/589,021, which is assigned to the assignee of the present application is incorporated by reference in its entirety.

In some embodiments, flow rate monitoring is performed by measuring flow through a flow restrictor placed in a portion of the fluid flow path. In certain embodiments, flow restrictor 278 illustrated in FIG. 2F can be used. The flow restrictor can be calibrated such that it can be used to reliably monitor flow rate for different types of wounds, dressings, and operating conditions. For example, a high precision silicon flow restrictor can be used. The flow restrictor can be located at any suitable location in the flow path, such as between the source of the negative pressure and the canister, such as upstream of the source of the negative pressure and downstream of the canister. A differential pressure sensor or two pressure sensors can be used to measure a pressure drop across the flow restrictor. For example, as explained above in connection with FIG. 2F, the pressure drop across the flow restrictor 278 can be measured using sensors 282 and 284. In certain embodiments, if the pressure drop falls below a pressure differential threshold, which indicates low flow, the measured flow rate is compared to a flow rate threshold. If the measured flow rate falls below the flow rate threshold, blockage condition is detected. Additional details of blockage detection are provided in U.S. Patent Publication No. 2011/0071483, which is assigned to the assignee of the present application is incorporated by reference in its entirety. In some embodiments, the measured flow rate is compared to a leakage threshold. If the measured flow rate exceeds the leakage threshold, a leak is detected. Additional details of leakage detection are provided in U.S. Pat. No. 8,308,714, which is assigned to a subsidiary of the assignee of the present application and is incorporated by reference in its entirety.

In some embodiments, blockages and presence of fluid in one or more tubes or lumens are detected by processing data from one or more pressure sensors, such as sensors 280, 282, and 284. This detection can be enhanced by changing one or more settings of the vacuum pump, such as increasing vacuum level delivered by the pump, decreasing the vacuum level, stopping the pump, changing the pump speed, changing a cadence of the pump, and the like. In some embodiments, as the pump operates, it generates pressure pulses that are propagated through the fluid flow path. The pressure pulses are illustrated in the pressure curve 1902 of FIG. 19A according to some embodiments. Region 1904 illustrates pressure pulses detected during normal operation of the system, and region 1906 illustrates pressure pulses detected when canister becomes full. As is illustrated, canister blockage causes a reduced volume to be seen upstream of the canister, and the amplitude of the pressure pulses increases. In certain embodiments, this change or “bounce” in the pressure pulse signal can be magnified or enhanced by varying the pump speed, varying the cadence of the pump, such as by adjusting PWM parameters, and the like. Such adjustments of pump operation can be performed over a short time duration and the changes can be small such that the operation of the system remains relatively unaffected.

In some embodiments, the increase in the amplitude of pressure pulses (region 1906) can be detected and compared to a blockage threshold in order to determine whether a blockage condition exists. In certain embodiments, the frequency, rate of change of the amplitude (or slope), rate of change of the frequency, etc. of the pressure pulse signal can be monitored in place of or in addition to monitoring the amplitude. For example, curve 1910 of FIG. 19B illustrates pressure sensed by a pressure sensor downstream of the canister filter. As is shown, small or no pressure pulses are detected when the canister filter becomes blocked. A large negative change in the detected pressure signal is observed, as is illustrated by the slope 1912. In some embodiments, signal processing techniques can be utilized, such as converting the detected pressure pulse signal into frequency domain, for example by using the Fast Fourier Transform (FFT), and analyzing the pressure pulse signal in the frequency domain. Additional details of flow rate detection are described in U.S. Patent Publication No. 2012/0078539, which is assigned to the assignee of the present application is incorporated by reference in its entirety.

In some embodiments, temporary blockages caused by slugs of fluid in tubes or lumens are detected by turning off the pump and monitoring the pressure change in the fluid flow path. The pump can be turned off for a short duration of time as to not affect the operation of the system. Presence of temporary blockages in the system due to slugs of fluid can cause vacuum level to decline in a discontinuous “stair and risers” pattern, such as that illustrated by curve 2002 of FIG. 20. This discontinuous decaying pattern is due to slugs of fluid moving through the fluid flow path and arriving at the canister inlet, which can suddenly change the volume seen by the pressure sensor (and the canister). When slugs of fluid are not present, a more continuous decaying pattern, such as illustrated in curve 2004, is observed. In certain embodiments, when the pattern illustrated in curve 2002 is detected, the system can increase the level of vacuum produced by the pump to clear the slugs.

In some embodiments, one or more flow sensors and/or flow meters can be used to directly measure the fluid flow. In some embodiments, the system can utilize one or more of the above flow rate monitoring techniques. For example, the system can utilize one or more of the above-described flow rate monitoring techniques. The system can be configured to suitably arbitrate between flow rates determined using multiple flow rate monitoring techniques if one or more such techniques are executed in parallel. In certain embodiments, the system execute one of the techniques, such as the flow rate determination based on the pump speed, and utilize one or more other techniques as needed. In various embodiments, the system can utilize one or more other techniques in cases the determine flow rate is perceived to be inaccurate or unreliable.

Other Variations

Any value of a threshold, limit, duration, etc. provided herein is not intended to be absolute and, thereby, can be approximate. In addition, any threshold, limit, duration, etc. provided herein can be fixed or varied either automatically or by a user. Furthermore, as is used herein relative terminology such as exceeds, greater than, less than, etc. in relation to a reference value is intended to also encompass being equal to the reference value. For example, exceeding a reference value that is positive can encompass being equal to or greater than the reference value. In addition, as is used herein relative terminology such as exceeds, greater than, less than, etc. in relation to a reference value is intended to also encompass an inverse of the disclosed relationship, such as below, less than, greater than, etc. in relations to the reference value.

Features, materials, characteristics, or groups described in conjunction with a particular aspect, embodiment, or example are to be understood to be applicable to any other aspect, embodiment or example described herein unless incompatible therewith. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive. The protection is not restricted to the details of any foregoing embodiments. The protection extends to any novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.

While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of protection. Indeed, the novel methods and systems described herein may be embodied in a variety of other forms. Furthermore, various omissions, substitutions and changes in the form of the methods and systems described herein may be made. Those skilled in the art will appreciate that in some embodiments, the actual steps taken in the processes illustrated and/or disclosed may differ from those shown in the figures. Depending on the embodiment, certain of the steps described above may be removed, others may be added. For example, the actual steps and/or order of steps taken in the disclosed processes may differ from those shown in the figure. Depending on the embodiment, certain of the steps described above may be removed, others may be added. For instance, the various components illustrated in the figures may be implemented as software and/or firmware on a processor, controller, ASIC, FPGA, and/or dedicated hardware. Furthermore, the features and attributes of the specific embodiments disclosed above may be combined in different ways to form additional embodiments, all of which fall within the scope of the present disclosure.

User interface screens illustrated and described herein can include additional and/or alternative components. These components can include menus, lists, buttons, text boxes, labels, radio buttons, scroll bars, sliders, checkboxes, combo boxes, status bars, dialog boxes, windows, and the like. User interface screens can include additional and/or alternative information. Components can be arranged, grouped, displayed in any suitable order.

Although the present disclosure includes certain embodiments, examples and applications, it will be understood by those skilled in the art that the present disclosure extends beyond the specifically disclosed embodiments to other alternative embodiments and/or uses and obvious modifications and equivalents thereof, including embodiments which do not provide all of the features and advantages set forth herein. Accordingly, the scope of the present disclosure is not intended to be limited by the specific disclosures of preferred embodiments herein, and may be defined by claims as presented herein or as presented in the future. 

What is claimed is:
 1. A negative pressure wound therapy apparatus comprising: a source of negative pressure configured to be fluidically connected to a dressing configured to be placed over a wound, the source of negative pressure being configured to aspirate fluid from the wound; and a controller programmed to: detect or cause detection of presence of at least one temporary blockage in a fluid flow path comprising the source of negative pressure, a canister configured to store fluid aspirated from the wound, and the dressing, the at least one temporary blockage being caused by fluid aspirated from the wound being aspirated into the canister; and clear or cause clearance of the at least one temporary blockage by increasing a level of negative pressure provided by the source of negative pressure, wherein the controller is programmed to detect or cause detection of presence of the at least one temporary blockage by deactivating or causing deactivation of the source of negative pressure and detecting or causing detection of a substantially discontinuous decay of negative pressure in the fluid flow path while the source of negative pressure is deactivated.
 2. The negative pressure wound therapy apparatus of claim 1, wherein the controller is further programmed to detect or cause detection of absence of the at least one temporary blockage in the fluid flow path by deactivating or causing deactivation of the source of negative pressure and detecting or causing detection of a substantially continuous decay of negative pressure in the fluid flow path while the source of negative pressure is deactivated.
 3. The negative pressure wound therapy apparatus of claim 1, further comprising a pressure sensor configured to measure pressure at an inlet of the source of negative pressure, wherein the controller is programmed to detect or cause detection of presence of the at least one temporary blockage by detecting an increase in pressure measured by the pressure sensor, the increase in pressure caused by the at least one temporary blockage.
 4. The negative pressure wound therapy apparatus of claim 1, wherein the controller is programmed to clear or cause clearance of the at least one temporary blockage in response to detecting or causing detection of absence of the at least one temporary blockage in the fluid flow path.
 5. The negative pressure wound therapy apparatus of claim 1, wherein the at least one temporary blockage is caused by a slug of fluid.
 6. The negative pressure wound therapy apparatus of claim 1, wherein the substantially discontinuous decay of negative pressure follows a discontinuous stair and risers pattern.
 7. The negative pressure wound therapy apparatus of claim 1, wherein the controller is programmed to detect or cause detection of presence of the at least one temporary blockage by deactivating or causing deactivation of the source of negative pressure for a duration of time that does not affect aspiration of fluid from the wound and detecting or causing detection of a substantially discontinuous decay of negative pressure in the fluid flow path while the source of negative pressure is deactivated.
 8. A method for applying negative pressure therapy to a wound, the method comprising: aspirating fluid from a wound with a source of negative pressure that is fluidically connected to a dressing placed over the wound; storing at least some fluid aspirated from the wound in a canister; detecting, with a controller, presence of a temporary blockage in a fluid flow path comprising the source of negative pressure, the canister, and the dressing, the temporary blockage being caused by the fluid aspirated from the wound being aspirated into the canister; and clearing, with the controller, the temporary blockage by increasing a level of negative pressure provided by the source of negative pressure, wherein said detecting comprises deactivating the source of negative pressure and detecting a substantially discontinuous decay of negative pressure in the fluid flow path while the source of negative pressure is deactivated.
 9. The method of claim 8, further comprising detecting, with the controller, absence of the temporary blockage in the fluid flow path by deactivating the source of negative pressure and detecting a substantially continuous decay of negative pressure in the fluid flow path while the source of negative pressure is deactivated.
 10. The method of claim 8, further comprising measuring, with a pressure sensor, pressure at an inlet of the source of negative pressure, wherein said detecting comprises detecting an increase in pressure measured at the inlet that is caused by the temporary blockage.
 11. The method of claim 8, wherein said clearing is performed in response to said detecting.
 12. The method of claim 8, wherein the temporary blockage is caused by a slug of fluid.
 13. The method of claim 8, wherein the substantially discontinuous decay of negative pressure follows a discontinuous stair and risers pattern.
 14. The method of claim 8, wherein said deactivating comprises deactivating the source of negative pressure for a duration of time that does not affect aspiration of fluid from the wound. 